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How do you treat brown spots on tomato plants?
What to do about tomato leaf spots
- Pinch off leaves with leaf spots and bury them in the compost pile.
- It is okay to remove up to a third of the plant’s leaves if you catch the disease early.
- Do not remove more than a third of the plant’s leaves.
- Keep leaves dry to reduce spreading the disease.
Why are my tomato plants turning yellow with black spots?
Fungal Disease Three common fungal diseases contribute to the development of yellow leaves and black spots on tomato plants. They are Fusarium wilt, early blight and Septoria leaf spot. Fusarium wilt causes older leaves to turn yellow and eventually turn black.
Why are the leaves on my tomato plant turning brown?
Signs of Verticillium wilt are similar to early blight and Septoria leaf spot. On the lower leaves, pale yellow spots begin to develop, surrounded by brown veins. These spots will eventually turn brown and the leaves will fall off the plant. Less common is Bacterial wilt, caused by a bacterium commonly found in sandy soils when they are moist.
What causes leaves to turn yellow with black spots?
They are Fusarium wilt, early blight and Septoria leaf spot. Fusarium wilt causes older leaves to turn yellow and eventually turn black. Leaves then fall off. Early blight becomes more prevalent in hot summers and causes target-like black spots to develop, according to the Colorado State University Extension.
Why are the leaves on my Alternaria turning yellow?
Alternaria leaf blight starts with small brown spots on the lower leaves near the base of the plant and progresses to a yellow halo. A plant with yellow leaves or wilting is a sign of fusarium wilt, and yellowing between the major leaf veins indicates verticillium wilt.
What to do about tomato plants with spots on leaves?
These spots are actually cankers and can eventually overtake a plant and kill it. Once a plant is infected tomato early blight alternaria, a fungicide can be sprayed on the plant. This can help reduce the damage from the plant, but frequently this will only lessen, not eliminate the problem.